Math Solver / Percentage Calculator
Percentage Calculator
Percent of a number, percent change, increase and decrease — with the formula shown every time.
Press Enter to solve · ^ for powers · sqrt() for roots · separate a system with a comma
Try:
The percentage calculator understands everyday questions. Type them the way you would say them and the solver shows the formula and each step.
What you can type
| Question | Type |
|---|---|
| What is X% of Y? | 15% of 240 |
| X is what percent of Y? | 18 is what percent of 72 |
| X is Y% of what? | 30 is 20% of what |
| Percent increase / decrease | increase 50 by 20% |
| Percent change | from 80 to 100 |
Percentage formulas
- Percent of a number: (P / 100) × number
- What percent: (part / whole) × 100
- Percent change: (new − old) / old × 100
Example: what percent of 72 is 18?
- Divide the part by the whole: 18 / 72 = 0.25.
- Multiply by 100: 25%.
Questions about percentages
How do I calculate a discount?
Type decrease 80 by 25%. The solver finds 25% of 80 (20) and subtracts it, giving 60.
Is percent change the same as percentage points?
No. Going from 40% to 50% is a 10 percentage-point increase but a 25% percent change.
Can a percentage be more than 100?
Yes. 150% of 40 is 60, and a value that triples has increased by 200%.